<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>主页</title>
    <style>
        html {
            filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
            -webkit-filter: grayscale(100%);
        }

       .flex-container {
           display: -webkit-flex;
           display: flex;
           width: 100%;
           background-color: lightgrey;

       }
        .flex-item3 {
            width: 736px;
            height: 100px;
        }
       .flex-item {
           width: 100px;
           height: 200px;
           margin: 10px;
       }
    </style>
</head>
<body>

<div class="flex-container">
    <div class="flex-item"></div>
    <div class="flex-item"></div>
    <div class="flex-item3">图书馆介绍
    <h1>复飞图书馆</h1>
        <img src="img/bg1.png">
    </div>
</div>

</body>
</html>